Carbon coated lithium sulfide particles for lithium battery cathodes

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• 作者：Sangsik Jeong ; Dominic Bresser ; Daniel Buchholz ; Martin Winter ; Stefano Passerini ; ^{stefano.passerini@uni-muenster.de}
• 关键词：Lithium sulfur battery ; Lithium sulfide ; Li2S ; Carbon coating ; PAN
• 刊名：Journal of Power Sources
• 出版年：2013
• 出版时间：1 August, 2013
• 年：2013
• 卷：235
• 期：Complete
• 页码：220-225
• 全文大小：759 K

文摘

In this paper, we investigated the properties of carbon coated lithium sulfide particles prepared following either a dry coating process or a wet coating process, using, respectively, sucrose or polyacrylonitrile (PAN) as carbon source. X-ray diffraction analysis revealed that the crystalline structure of the pristine Li₂S was basically preserved upon both coating processes. The dry coating process (Li₂S-C_sucrose) resulted in Li₂S particles covered only partially by smaller carbon particles, whereas the wet coating method (Li₂S-C_PAN) gave Li₂S particles, homogenously decorated with thin carbon flakes. As a result, the cycling performance of Li₂S-C based electrodes was significantly improved, particularly for Li₂S-C_PAN, for which a coulombic efficiency of more than 99.5 % was obtained.